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Antenna device

a technology of antenna array and antenna, applied in the field of antenna devices, can solve the problems of difficult application of ebg to a wideband antenna, complex substrate structure, and error in detection of targets, so as to improve the gain in the compensation direction, broaden the bandwidth, and simplify the configuration

Active Publication Date: 2018-12-20
DENSO CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present patent text describes a technique for preventing the influence of reflected waves in an environment where radio waves are reflected. The technique involves using a dielectric substrate with a simple configuration that scatters reflected waves in various directions, reducing the reflection intensity of re-reflected waves and interfering with them without forming a strong beam towards a specific direction. This configuration improves the gain in the compensation direction and brocols the bandwidth with a simpler configuration compared to using the EBG.

Problems solved by technology

As a result of detailed examination by the inventors, there was found a problem in PTL 1 that by using the electromagnetic wave reflection plane, a strong beam, which differs from a main beam, is formed in a reflection direction of the re-reflected waves coming from the antenna radiation plane, which may cause erroneous detection of a target.
Further, as a result of detailed examination by the inventors, a problem was found in PTL 2 that by using the EBG that requires formation of through holes in the substrate, the structure of substrate becomes complex.
Therefore, as a result of detailed examination by the inventors, there is found a problem using the EBG that a frequency band that can be blocked is narrow, and therefore, applying the EBG to a wideband antenna is difficult.

Method used

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Examples

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first embodiment

1. First Embodiment

[0041][1-1. Configuration]

[0042]An antenna device 1 is mounted inside a bumper of a vehicle and constitutes a millimeter-wave radar that detects various targets existing around the vehicle.

[0043]As shown in FIG. 1 and FIG. 2, the antenna device 1 is formed with copper patterns formed on a dielectric substrate 2 having a rectangular shape. In the following, the dielectric substrate 2 has one surface referred to as a substrate front surface 2a, and another surface referred to as a substrate back surface 2b. Additionally, a direction along one side of the dielectric substrate 2 is referred to as an x-axis direction, a direction along the other side orthogonal to the x-axis direction is referred to as a y-axis direction, and a normal direction of the substrate front surface 2a is referred to as a z-axis direction.

[0044]The substrate back surface 2b is formed with a ground plate 3 including a copper pattern covering the entire surface of the substrate back surface 2b. ...

second embodiment

2. Second Embodiment

[0069][2-1. Configuration]

[0070]An antenna device 6 is, for example, mounted in a vehicle, and used for a millimeter-wave radar for detecting various targets existing around the vehicle.

[0071]As shown in FIGS. 13 and 14, the antenna device 6 includes, a dielectric substrate 7 having a rectangular shape and a copper pattern formed on the dielectric substrate 7. In the following, the dielectric substrate 7 has one surface referred to as a substrate front surface 7a, and another surface referred to as a substrate back surface 7b. Additionally, a direction along a long side of the dielectric substrate 7 is referred to as an x-axis direction, a direction along the other short side orthogonal to the x-axis direction is referred to as a y-axis direction, and a normal direction of the substrate front surface 7a is referred to as a z-axis direction.

[0072]The substrate back surface 7b is formed with a ground plate 8 including a copper pattern covering the entire surface of...

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PUM

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Abstract

An antenna device includes a dielectric substrate, a ground plate arranged on a first surface of the dielectric substrate, an antenna part arranged on a second surface of the dielectric substrate, and a reflecting part. The reflecting part is arranged around the antenna part and has a plurality of conductor patches each functioning as a reflecting plate. The plurality of conductor patches form a plurality of blocks aligned along a predetermined block arrangement direction. The plurality of blocks are configured such that phases of reflected waves at an operating frequency are different for each of the blocks and phase differences of reflected waves between adjacent blocks are non-uniformly different for each of the adjacent blocks.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]The present international application claims the benefits of priority to Japanese Patent Application No. 2015-244384 filed in Japan Patent Office on Dec. 15, 2015, and Japanese Patent Application No. 2016-175795 filed in Japan Patent Office on Sep. 8, 2016, the entire contents of Japanese Patent Application No. 2015-244384 and Japanese Patent Application No. 2016-175795 are incorporated by reference in the present international application.TECHNICAL FIELD[0002]The present disclosure relates to an antenna device using a dielectric substrate.BACKGROUND ART[0003]An antenna formed on a dielectric substrate has been used for a radar, for example, on a mobile object, such as a vehicle or an airplane, for monitoring the surroundings of the mobile object.[0004]When using such type of antenna for vehicle radar apparatus, the antenna may be mounted inside a vehicle bumper, for example. In this case, it has been known that part of radio waves radiate...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H01Q1/38H01Q19/00H01Q1/48H01Q21/06H01Q1/32
CPCH01Q1/38H01Q19/005H01Q1/48H01Q21/065H01Q1/3233H01Q1/3283H01Q9/0407H01Q15/006G01S2013/93275
Inventor KAWAGUCHI, KAZUSHISAKURAI, KAZUMASASAKAI, TOSHIYAKONDO, ASAHI
Owner DENSO CORP
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